Investigation of passive films on nickel Alloy 690 in lead-containing environments |
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| Authors: | B Peng BT Lu JL Luo YC Lu HY Ma |
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| Affiliation: | aDepartment of Chemical and Materials Engineering, University of Alberta Edmonton, Alberta, Canada T6G 2G6;bComponent Life Technology, Station 80, Atomic Energy of Canada Ltd., Chalk River Laboratories, Chalk River, Ontario, Canada K0J 1J0;cDepartment of Chemistry, Shandong University, Jinan, Shandong 250100, PR China |
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| Abstract: | Passive films formed on Alloy UNS N06690 were investigated in simulated crevice chemistries. It was found the role of lead in corrosion processes is strongly dependent on the pH value of the testing solutions. At pH 1.5 the effect of lead is narrowly noticeable; while at pH 12.7, lead has a significant influence on the electrochemical performance of alloy UNS N06690. The lead alters the surface morphologies at both pH and account for higher hydroxide content in the surface film at pH 12.7. The lead incorporation hinders the formation of spinel oxides during the passivation in alkaline solution. Nanoindentation tests indicate a significant lead-induced degradation in the mechanical properties of passive films. The passivation degradation is attributed to detrimental effects of lead via interrupting the dehydration process and hindering the formation of protective layers on the alloy surface. |
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| Keywords: | 62 20 Mk 28 52 Fa 82 45 Bb |
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